<template>
  <!-- 商品分类导航 -->
  <div class="type-nav">
    <div class="container">
      <h2 class="all">全部商品分类</h2>
      <nav class="nav">
        <a href="###">服装城</a>
        <a href="###">美妆馆</a>
        <a href="###">尚品汇超市</a>
        <a href="###">全球购</a>
        <a href="###">闪购</a>
        <a href="###">团购</a>
        <a href="###">有趣</a>
        <a href="###">秒杀</a>
      </nav>
      <div class="sort">
        <div class="all-sort-list2">
          <div
            class="item"
            v-for="(categroy, index) in categoryList"
            :key="categroy.categoryId"
            :class="currentIndex === index ? 'active' : ''"
            @mouseenter="throttleEnter(index)"
            @mouseleave="currentIndex = -1"
            @click="toSearch"
          >
            <h3>
              <!-- 设置自定义属性 -->
              <a
                :data-categroy1Id="categroy.categoryId"
                :data-categroyName="categroy.categoryName"
                >{{ categroy.categoryName }}</a
              >
            </h3>
            <div class="item-list clearfix">
              <div class="subitem">
                <dl
                  class="fore"
                  v-for="Child in categroy.categoryChild"
                  :key="Child.categoryId"
                >
                  <dt>
                    <a
                      :data-categroy2Id="Child.categoryId"
                      :data-categroyName="Child.categoryName"
                      >{{ Child.categoryName }}</a
                    >
                  </dt>
                  <dd>
                    <em
                      v-for="item in Child.categoryChild"
                      :key="item.categoryId"
                    >
                      <a
                        :data-categroy3Id="item.categoryId"
                        :data-categroyName="item.categoryName"
                        >{{ item.categoryName }}</a
                      >
                    </em>
                  </dd>
                </dl>
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
//引入lodash
import _ from "lodash";
import { mapActions, mapState } from "vuex";
export default {
  name: "NavType",
  data() {
    return {
      currentIndex: -1,
    };
  },
  mounted() {
    //调用三级分类列表请求
    this.getcategoryList();
    //节流
    this.throttleEnter = _.throttle(this.mouseEnter, 30, {
      //第一次不执行
      trailing: false,
      //最后一次执行
      leading: true,
    });
  },
  computed: {
    ...mapState("home", ["categoryList"]),
  },
  methods: {
    ...mapActions("home", ["getcategoryList"]),
    //鼠标移入移出
    mouseEnter(index) {
      this.currentIndex = index;
    },
    //事件委托 三级列表跳转search组件
    toSearch(e) {
      //解构自定义属性
      const { categroy1id, categroyname, categroy2id, categroy3id } =
        e.target.dataset;
      const query = {};
      query.categroyName = categroyname;
      if (categroy1id) {
        query.categroy1Id = categroy1id;
      } else if (categroy2id) {
        query.categroy2Id = categroy2id;
      } else if (categroy3id) {
        query.categroy3Id = categroy3id;
      }
      //判断用户是否点击的是三级列表分类
      if (e.target.nodeName === "A") {
        this.$router.push({
          path: "/search",
          query: query,
        });
      }
    },
  },
};
</script>

<style lang="less" scoped>
.type-nav {
  border-bottom: 2px solid #e1251b;

  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: #fafafa;
      z-index: 999;

      .all-sort-list2 {
        .item {
          h3 {
            line-height: 30px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 20px;
            margin: 0;

            a {
              color: #333;
            }
          }

          .item-list {
            display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }

          &.active {
            background-color: aquamarine;
            .item-list {
              display: block;
            }
          }
        }
      }
    }
  }
}
</style>
